Would I have any issues with this setup on an e93 m3 at stock height (no coils etc and no spacers without any guard work) strut clearance? rubbing on full lock? etc

Front: 19x9.5 et +32 (265/30/19)
Rear: 19x11 et +25 (305/30/19)

The wheel sizes are well suited for a 275/30 & 295/30 combo. The et 32 offset is more conservative than i would want but i don't think you will rub the strut. If so you can add a 10-12mm spacer (I run 9.5 et 22) but that will require some negative camber to look right. 265/30 should work too. The only negative is the profile is lower than ideal on the latter option. As for the rear, I think you will rub with 305's so i would choose 295's. At the end of the day these are aggressive wheel sizes that may require some trial and error. I wouldn't hesitate to run those sizes but I'm willing to make the necessary adjustments to make them fit. You are at stock height which makes things easier....